The weather observed at BOSTON, MA (KBOS) at 03:54 AM EDT was: The skies were cloudy. Temperature: 48F ( 9C) Dewpoint: 43F ( 6C) Relative Humidity: 81% Winds from the SW (210 degs) at 10 mph. Pressure: 1015.5 millibars. Altimeter:29.99 inches of mercury. The prevailing visibility was 10 miles.